4.5.3 Operating modes
Operating mode Description
Spin-Up Start up time period from spindle stop or power down.
Seek Seek operation mode
Write Write operation mode
Read Read operation mode
Performance The device is capable of responding immediately to idle media access requests
All electronic components remain powered and the full frequency servo remains
operational.
Active idle The device is capable of responding immediately to media access requests.
Some circuitry—including servo system and R/W electronics—is in power saving
mode.
The head is parked near the mid-diameter the disk without servoing.
A device in Active idle mode may take longer to complete the execution of a
command because it must activate that circuitry.
Low power idle The head is unloaded onto the ramp position. The spindle motor is rotating at full
speed.
Standby The device interface is capable of accepting commands. The spindle motor is
stopped. All circuitry but the host interface is in power saving mode. The
execution of commands is delayed until the spindle becomes ready.
Sleep The device requires a soft reset or a hard reset to be activated. All electronics,
including spindle motor and host interface, are shut off.
Figure 17. Operating modes
4.5.3.1 Mode transition time
Transition Time
(max.)
Transition Time
(typ)
ToFrom
Figure 18. Drive ready time for all models
4.5.3.2 Operating mode at power on
The device goes into Idle mode after power on or hard reset as an initial state. Initial state may be
changed to Standby mode using pin C on the interface connector. Refer to Section 7.10, "Drive address
setting" on page 62 for details.
4.5.3.3 Adaptive power save control
The transient timing from Performance Idle mode to Low Power Idle is controlled adaptively according to
the access pattern of the host system in order to reduce the average power dissipation.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
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